Design for a boat



FIG. 1 is a perspective view of the boat of the present invention;

FIG. 2 is a top plan view thereof;

FIG. 3 is an elevational view of the right side thereof, the left side being a mirror image of the right side;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a boat, substantially as shown and described. 